<template>
	<div class="star" :class="starType">
		<span v-for="itemClass in itemClasses" :class="itemClass" class="star-item"></span>
	</div>
</template>

<script type="text/ecmascript-6">
	const LENGTH = 5;
	const CLS_ON = 'on';
	const CLS_HALF = 'half';
	const CLS_OFF = 'off';

	export default{
		props: {
			size: {
				type: Number
			},
			score: {
				type: Number
			}
		},
		computed: {
			starType() {
				return 'star-' + this.size;
			},
			itemClasses() {
				let result = [];
				let score = Math.floor(this.score * 2) / 2;
				let hasDecimal = score % 1 !== 0;
				let integer = Math.floor(score);
				for (let i = 0; i < integer; i++) {
					result.push(CLS_ON);
				}
				if (hasDecimal) {
					result.push(CLS_HALF);
				}
				while (result.length < LENGTH) {
					result.push(CLS_OFF);
				}
				return result;
			}
		}
	};
</script>

<style lang="stylus" rel="stylesheet/stylus">
	@import "../../common/stylus/mixin.styl"
	.star
		font-size 0
		.star-item
			display inline-block
			background-repeat no-repeat
		&.star-48
			.star-item
				width 20px
				height 20px
				margin-right 22px
				background-size cover
				&:last-child
					margin-right 0
				&.on
					bg-img("star48_on")
				&.half
					bg-img("star48_half")
				&.off
					bg-img("star48_off")
		&.star-36
			.star-item
				width 15px
				height 15px
				margin-right 10px
				background-size cover
				&:last-child
					margin-right 0
				&.on
					bg-img("star36_on")
				&.half
					bg-img("star36_half")
				&.off
					bg-img("star36_off")
		&.star-24
			.star-item
				width 10px
				height 10px
				margin-right 3px
				background-size cover
				&:last-child
					margin-right 0
				&.on
					bg-img("star24_on")
				&.half
					bg-img("star24_half")
				&.off
					bg-img("star24_off")
</style>